Anyone who has smelled a dead animal in a house will recognize it again. The odor is sharp or sweetish, heavy and stubborn, and it tends to build over several days. In a closed house it seems to arrive from every direction, which makes the hunt frustrating.
Below: the reasons animals die inside houses, how to narrow down where, and what removal involves.
Why animals die inside walls.
A rodent that has eaten bait will often withdraw to a quiet spot before it dies, maybe inside a wall cavity, in a corner of the attic or under the house. Others get trapped in a space they cannot leave, or die of illness or age. Whatever the cause, the body has nowhere to go.
Within a few days the smell begins, and flies often follow. Warm, humid conditions speed the process, and cold, dry ones slow it. In a damp climate, smell can linger longer than expected.
Narrowing down the source.
- Walk each room and compare how strong the smell is.
- Look for flies at windows or around a light.
- Check ceilings and walls for stains or dark spots.
- Smell near floor vents, closets and under cabinets.
- Check the attic hatch and the crawlspace access door.
If the smell is strongest in one room and rises toward the ceiling, an attic or wall void above is likely. If it is strongest at floor level and near a vent, a crawlspace or duct may be the source.
What not to do.
Do not cut into a wall without a clear reason. The smell may be coming from a duct or from the other side of a joist. Do not use foggers or heavy sprays, which can mask the smell and irritate lungs. Do not handle an animal with bare hands.
If you find the body, wear gloves, wet the area, place the animal and any wipes in a sealed bag and wash your hands. The CDC advises this approach and the safety block below summarizes it.
What the technician does on site.
The technician maps the smell, checks likely spaces and may use a small inspection camera to look into voids. If the source is behind a wall, they explain the options, such as a small access opening, and the likely cost before cutting anything.
| Where it is. | Likely approach. | Notes. |
|---|---|---|
| Wall void. | Small access opening, remove, patch. | Drywall repair may be needed. |
| Attic insulation. | Remove and replace soiled batts. | Check for entries to prevent a repeat. |
| Crawlspace. | Locate, bag, treat the area. | Moisture control matters. |
| Duct or soffit. | Open the access, remove, clean. | Check for damage that needs repair. |
Curious what a visit looks like? Ask during the call and get a plain answer.
Ring (888) 686-4821After the animal is gone.
The area gets cleaned and treated, and soiled material may need replacing. Airing and drying help the odor fade. If the entries stay open, the same thing can happen again, so exclusion work comes next. Odor control describes the whole process.
In the weeks afterward, keep windows open when the weather allows and run a fan or dehumidifier in damp spaces. If the smell returns or grows, call again, because a second animal or a missed spot may be the cause.
A short list for the waiting period.
- Open windows and run fans when the weather permits.
- Keep kids and pets away from the room with the strongest odor.
- Record when the smell started and whether it is getting worse.
- Pass on poison, sprays and foggers.
- Take pictures of any stains on ceilings or walls.
Notes kept on a phone help the technician plan the search. If flies are present, write down where they gather, because that is frequently near the source.
Safety steps for waste and nests
Federal health agencies offer every home the same guidance, and none of it relies on hiring a company.
- Dampen dry waste before anything else touches it. Dry sweeping is out.
- Stale air can carry what the eye misses. Open up, back away and wait half an hour.
- Either disposable or reusable rubber gloves will do, as long as you wash both the gloves and your hands.
- Think of three beats, soak then pause then wipe, where the pause lasts around five minutes.
- Knot the bag hard before it leaves the house, and keep your hands covered if a dead rodent must be moved.
- If a flu-like illness or shortness of breath follows exposure, a physician should hear about the cleanup and make the diagnosis.
Where the safety advice comes from
Claims about cleanup and bait on this page originate in the public pages that follow.
- Hantavirus Prevention, from the CDC: The CDC's three-part message on keeping rodents out: seal up, trap up, clean up.
- Cleaning Up After Rodents, from the CDC: Airing out a closed space, wetting droppings rather than sweeping, and bagging waste with care.